There is disclosed an embodiment for providing a color reconstruction image. An ultrasound data acquisition unit transmits a ultrasound signal to a target object and receive an echo signal reflected from the target object to acquire ultrasound data. A user interface receives input information from a user. A processor is in communication with the ultrasound data acquisition unit and the user interface. The processor is configured to form a color Doppler mode image and a color map by using the ultrasound data, detects pixels corresponding to colors within a region of interest set in the color map from the color Doppler mode image based on the input information and forms a color reconstruction image represented by the colors corresponding to the detected pixels.